为什么错误"NoneType"对象没有属性“内容"，而仅用两个相似的命令之一发生?

问题描述

我正在从此 url 中提取内容.

I'm extracting content from this url.

import requests
from bs4 import BeautifulSoup

url = 'https://www.collinsdictionary.com/dictionary/french-english/aimer'
headers = {'User-Agent': 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0'}
soup = BeautifulSoup(requests.get(url, headers = headers).content, 'html.parser')

for script in soup.select('script, .hcdcrt, #ad_contentslot_1, #ad_contentslot_2'):
    script.extract()

entry_name = soup.h2.text
content1 = ''.join(map(str, soup.select_one('.cB cB-def dictionary biling').contents))

然后我遇到了错误

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-84-e9cb11cd6b5d> in <module>
     10 
     11 entry_name = soup.h2.text
---> 12 content1 = ''.join(map(str, soup.select_one('.cB cB-def dictionary biling').contents))

AttributeError: 'NoneType' object has no attribute 'contents'

另一方面，如果我将cB cB-def dictionary biling替换为hom，即content1 = ''.join(map(str, soup.select_one('.hom').contents))，则代码运行良好.从下面的html结构中，我认为cB cB-def dictionary biling和hom非常相似.

On the other hand, if I replace cB cB-def dictionary biling by hom, i.e. content1 = ''.join(map(str, soup.select_one('.hom').contents)) then the code runs well. From below structure of the html, I think that cB cB-def dictionary biling and hom are very similar.

请您详细说明这种问题是如何产生的以及如何解决?

Could you please elaborate on how such problem arises and how to solve it?

推荐答案

尝试一下:

import requests
from bs4 import BeautifulSoup

url = 'https://www.collinsdictionary.com/dictionary/french-english/aimer'
headers = {'User-Agent': 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0'}
soup = BeautifulSoup(requests.get(url, headers = headers).content, 'html.parser')

for script in soup.select('script, .hcdcrt, #ad_contentslot_1, #ad_contentslot_2'):
    script.extract()

entry_name = soup.h2.text
content1 = ''.join(map(str, soup.select_one('.cB.cB-def.dictionary.biling').contents))

选择类时，其中的类是blank-spaces，请用.替换空格.

When you select classes and it is blank-spaces in it you replace the space with ..

cB，cB-def，dictionary和biling是四个不同的类.并且，如果您在其中留有空格，则脚本会在类cB的标签内寻找类cB-def的标签，依此类推....

cB, cB-def, dictionary and biling is four different classes. And if you let the spaces be there the script looking for a tag with class cB-def inside of a tag with class cB and so on....

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